X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Ftarget-thread.lisp;h=62c7b03612ccc621d51c41b9be2dd8f4861ce413;hb=15d6e7c9a2c3234f95dfe278046fa2fee1b0c007;hp=510cd32bb1a5fd3813b32f122a395ed1c1fd9fc5;hpb=e791de3ae4440919e43307a90895c161d3f3b1bc;p=sbcl.git diff --git a/src/code/target-thread.lisp b/src/code/target-thread.lisp index 510cd32..62c7b03 100644 --- a/src/code/target-thread.lisp +++ b/src/code/target-thread.lisp @@ -1,16 +1,29 @@ +;;;; support for threads in the target machine + +;;;; This software is part of the SBCL system. See the README file for +;;;; more information. +;;;; +;;;; This software is derived from the CMU CL system, which was +;;;; written at Carnegie Mellon University and released into the +;;;; public domain. The software is in the public domain and is +;;;; provided with absolutely no warranty. See the COPYING and CREDITS +;;;; files for more information. + (in-package "SB!THREAD") ;;; FIXME it would be good to define what a thread id is or isn't (our ;;; current assumption is that it's a fixnum). It so happens that on ;;; Linux it's a pid, but it might not be on posix thread implementations -(sb!alien::define-alien-routine ("create_thread" %create-thread) - sb!alien:unsigned-long - (lisp-fun-address sb!alien:unsigned-long)) +(define-alien-routine ("create_thread" %create-thread) + unsigned-long + (lisp-fun-address unsigned-long)) -(sb!alien::define-alien-routine "signal_thread_to_dequeue" - sb!alien:unsigned-int - (thread-id sb!alien:unsigned-long)) +(define-alien-routine "signal_thread_to_dequeue" + unsigned-int + (thread-id unsigned-long)) + +(define-alien-routine reap-dead-threads void) (defvar *session* nil) @@ -110,6 +123,9 @@ ;;; i suspect there may be a race still in this: the futex version requires ;;; the old mutex value before sleeping, so how do we get away without it (defun get-mutex (lock &optional new-value (wait-p t)) + "Acquire LOCK, setting it to NEW-VALUE or some suitable default value +if NIL. If WAIT-P is non-NIL and the lock is in use, sleep until it +is available" (declare (type mutex lock) (optimize (speed 3))) (let ((pid (current-thread-id))) (unless new-value (setf new-value pid)) @@ -133,7 +149,8 @@ (let ((pid (current-thread-id)) old) (unless new-value (setf new-value pid)) - (assert (not (eql new-value (mutex-value lock)))) + (when (eql new-value (mutex-value lock)) + (warn "recursive lock attempt ~S~%" lock)) (loop (unless (setf old (sb!vm::%instance-set-conditional lock 4 nil new-value)) @@ -155,16 +172,6 @@ (setf (mutex-value lock) nil) (futex-wake (mutex-value-address lock) 1)) - -(defmacro with-mutex ((mutex &key value (wait-p t)) &body body) - (with-unique-names (got) - `(let ((,got (get-mutex ,mutex ,value ,wait-p))) - (when ,got - (unwind-protect - (progn ,@body) - (release-mutex ,mutex)))))) - - ;;;; condition variables (defun condition-wait (queue lock) @@ -241,11 +248,12 @@ time we reacquire LOCK and return to the caller." (defun maybe-install-futex-functions () #!+sb-futex (unless (zerop (extern-alien "linux_supports_futex" int)) - (setf (fdefinition 'get-mutex) #'get-mutex/futex - (fdefinition 'release-mutex) #'release-mutex/futex - (fdefinition 'condition-wait) #'condition-wait/futex - (fdefinition 'condition-broadcast) #'condition-broadcast/futex - (fdefinition 'condition-notify) #'condition-notify/futex) + (sb!ext:without-package-locks + (setf (fdefinition 'get-mutex) #'get-mutex/futex + (fdefinition 'release-mutex) #'release-mutex/futex + (fdefinition 'condition-wait) #'condition-wait/futex + (fdefinition 'condition-broadcast) #'condition-broadcast/futex + (fdefinition 'condition-notify) #'condition-notify/futex)) t)) (defun make-thread (function) @@ -257,20 +265,22 @@ time we reacquire LOCK and return to the caller." ;; in time we'll move some of the binding presently done in C ;; here too (let ((sb!kernel::*restart-clusters* nil) + (sb!kernel::*handler-clusters* nil) + (sb!kernel::*condition-restarts* nil) (sb!impl::*descriptor-handlers* nil) ; serve-event (sb!impl::*available-buffers* nil)) ;for fd-stream ;; can't use handling-end-of-the-world, because that flushes ;; output streams, and we don't necessarily have any (or we ;; could be sharing them) (sb!sys:enable-interrupt sb!unix:sigint :ignore) - (sb!unix:unix-exit - (catch 'sb!impl::%end-of-the-world - (with-simple-restart - (destroy-thread - (format nil "~~@" - (current-thread-id))) - (funcall real-function)) - 0)))))))) + (catch 'sb!impl::%end-of-the-world + (with-simple-restart + (destroy-thread + (format nil "~~@" + (current-thread-id))) + (funcall real-function)) + 0)) + (values)))))) (with-mutex ((session-lock *session*)) (pushnew tid (session-threads *session*))) tid)) @@ -298,13 +308,30 @@ time we reacquire LOCK and return to the caller." ;;; locks, you probably won't like the effect. Used with thought ;;; though, it's a good deal gentler than the last-resort functions above +(define-condition interrupt-thread-error (error) + ((thread :reader interrupt-thread-error-thread :initarg :thread) + (errno :reader interrupt-thread-error-errno :initarg :errno)) + (:report (lambda (c s) + (format s "interrupt thread ~A failed (~A: ~A)" + (interrupt-thread-error-thread c) + (interrupt-thread-error-errno c) + (strerror (interrupt-thread-error-errno c)))))) + (defun interrupt-thread (thread function) - "Interrupt THREAD and make it run FUNCTION. " - (sb!unix::syscall* ("interrupt_thread" - sb!alien:unsigned-long sb!alien:unsigned-long) - thread - thread (sb!kernel:get-lisp-obj-address - (coerce function 'function)))) + "Interrupt THREAD and make it run FUNCTION." + (let ((function (coerce function 'function))) + (sb!sys:with-pinned-objects + (function) + (multiple-value-bind (res err) + (sb!unix::syscall ("interrupt_thread" + sb!alien:unsigned-long sb!alien:unsigned-long) + thread + thread + (sb!kernel:get-lisp-obj-address function)) + (unless res + (error 'interrupt-thread-error :thread thread :errno err)))))) + + (defun terminate-thread (thread-id) "Terminate the thread identified by THREAD-ID, by causing it to run SB-EXT:QUIT - the usual cleanup forms will be evaluated" @@ -328,6 +355,27 @@ SB-EXT:QUIT - the usual cleanup forms will be evaluated" until (sb!sys:sap= thread (sb!sys:int-sap 0)) collect (funcall function thread)))) +(defun thread-sap-from-id (id) + (let ((thread (alien-sap (extern-alien "all_threads" (* t))))) + (loop + (when (sb!sys:sap= thread (sb!sys:int-sap 0)) (return nil)) + (let ((pid (sb!sys:sap-ref-32 thread (* 4 sb!vm::thread-pid-slot)))) + (when (= pid id) (return thread)) + (setf thread (sb!sys:sap-ref-sap thread (* 4 sb!vm::thread-next-slot))))))) + +;;; internal use only. If you think you need to use this, either you +;;; are an SBCL developer, are doing something that you should discuss +;;; with an SBCL developer first, or are doing something that you +;;; should probably discuss with a professional psychiatrist first +(defun symbol-value-in-thread (symbol thread-id) + (let ((thread (thread-sap-from-id thread-id))) + (when thread + (let* ((index (sb!vm::symbol-tls-index symbol)) + (tl-val (sb!sys:sap-ref-32 thread (* 4 index)))) + (if (eql tl-val sb!vm::unbound-marker-widetag) + (sb!vm::symbol-global-value symbol) + (sb!kernel:make-lisp-obj tl-val)))))) + ;;;; job control, independent listeners (defstruct session @@ -344,15 +392,15 @@ SB-EXT:QUIT - the usual cleanup forms will be evaluated" (defun init-job-control () (setf *session* (new-session))) -(defun %delete-thread-from-session (tid) - (with-mutex ((session-lock *session*)) - (setf (session-threads *session*) - (delete tid (session-threads *session*)) - (session-interactive-threads *session*) - (delete tid (session-interactive-threads *session*))))) +(defun %delete-thread-from-session (tid session) + (with-mutex ((session-lock session)) + (setf (session-threads session) + (delete tid (session-threads session)) + (session-interactive-threads session) + (delete tid (session-interactive-threads session))))) (defun call-with-new-session (fn) - (%delete-thread-from-session (current-thread-id)) + (%delete-thread-from-session (current-thread-id) *session*) (let ((*session* (new-session))) (funcall fn))) (defmacro with-new-session (args &body forms) @@ -361,14 +409,18 @@ SB-EXT:QUIT - the usual cleanup forms will be evaluated" `(labels ((,fb-name () ,@forms)) (call-with-new-session (function ,fb-name))))) -;;; this is called from a C signal handler: some signals may be masked +;;; Remove thread id TID from its session, if it has one. This is +;;; called from C reap_dead_threads() so is run in the context of +;;; whichever thread called that (usually after a GC), which may not have +;;; any meaningful parent/child/sibling relationship with the dead thread (defun handle-thread-exit (tid) - "Remove thread id TID from the session, if it's there" - (%delete-thread-from-session tid)) + (let ((session (symbol-value-in-thread '*session* tid))) + (and session (%delete-thread-from-session tid session)))) (defun terminate-session () - "Kill all threads in session exept for this one. Does nothing if current + "Kill all threads in session except for this one. Does nothing if current thread is not the foreground thread" + (reap-dead-threads) (let* ((tid (current-thread-id)) (to-kill (with-mutex ((session-lock *session*))